A super resolution approach for spectral unmixing of remote sensing images

It is well known that coarse spatial resolution is an important factor for the occurrence of mixed pixels in remote sensing images, and conventional approaches for spectral unmixing adopt various techniques on spectral dimension only in a fixed spatial resolution. In this article, a super resolution (SR) approach for spectral unmixing is proposed, based on the assumption that increasing the spatial resolution helps to retrieve the composition of a pixel. Firstly, a remote sensing image is downscaled into an SR image using example-based kernel ridge regression (EBKRR). Secondly, the SR image is classified using supervised hard classification, and then the class map is decomposed into thematic class layers. Thirdly, the thematic class layers are upscaled into the original spatial resolution with an averaging operation, and the abundance maps are finally derived. In two simulated data-based experiments and one ground data-based experiment, this approach was compared with linear spectral mixture analysis (LSMA) and artificial neural network (ANN)-based spectral unmixing methods. The accuracy assessment indicated that the SR approach outperformed LSMA and ANN under measurements of mean absolute error and absolute bias in the three experiments.     

电力配电自动化技术的探讨

针对自动化技术的布置流程进行详细论述,能够使电力企业快速适应多元事业的规划标准,为用户各类生产、生活需求奠定适应基础。     

电网安全风险的调度应对体系研究

随着电力体制改革的不断深入以及近年来国内外相继出现的一系列大停电事故,电网安全已被上升到国家安全、社会稳定的战略高度,引起各方高度关注.电网企业将电网安全风险管理能力作为其立身之本、价值创造和赢得未来竞争的核心竞争力.基于此,重点从电网调度的角度,较为系统地探讨了电网安全风险的调度应对体系.     

回转器基本特性分析及其实现方法

在有源RC网络综合中,常用电阻、电容和运算放大器的综合。电路微型化的趋势和固件的出现,导致使用回转器和理想变压器而不使用电感来进行综合。在分析了回转器原理及其基本特性的基础上,用回转器模拟浮地电感或接地电感,以及用模拟电感来实现二阶带通与低通电路。并研讨了用运算放大器与负电阻来实现回转器网络的方法。     

350MW超临界直流锅炉水冷壁H型鳍片开裂失效分析

采用宏观形貌分析、化学成分分析、显微组织分析和数值模拟等方法对某电厂350MW超临界直流锅炉水冷壁H型鳍片开裂原因进行分析。分析结果表明,该锅炉水冷壁H型鳍片开裂的主要原因是鳍片较宽且厚度设计过小,致使鳍片不能被有效冷却而造成严重老化和脱碳,在交变热应力的作用下产生热疲劳而开裂。通过分析计算,确定了鳍片的合理厚度供参考。     

元宝山电厂快控汽门的研究与实施

在分析和介绍元宝山电厂和辽西电网情况的基础上，着重介绍了对元宝山电厂３００ＭＷ机组实施快控汽门的研究、试验工作及主要的技术成果。该厂３００ＭＷ机组快控汽门方式的投入，提高了电网稳定性和经济效益。     

应用于信号处理的Fourier变换与小波变换

在分析Fourier变换与小波变换异同点的基础上,对它们在不同类型信号的处理过程中的应用进行了探讨．并给出一个检测故障点的仿真实例,证明了小波变换的优越性．     

3D Shape Recognition Based on Multimodal \newline Relation Modeling

To make full use of the local spatial relation between point cloud and multi-view data to further improve the accuracy of three-dimensional (3D) shape recognition, a 3D shape recognition network based on multimodal relation is proposed. Firstly, a Multimodal Relation Module (MRM) is designed, which can extract the relation information between the local features of any point cloud and that of any multi-view to obtain the corresponding relation features. Then, a cascade pooling consisting of maximum pooling and generalized mean pooling is applied to process the relation feature tensor and obtain the global relation feature. There are two types of multimodal relation modules, which output the point-view relation feature and the view-point relation feature, respectively. The proposed gating module adopts a self-attentive mechanism to find the relation information within the features so that the aggregated global features can be weighted to suppress redundant information. Extensive experiments show that the multimodal relation module can make the network obtain stronger representational ability; the gating module can make the final global feature more discriminative and boost the performance of the retrieval task. The proposed network achieves classification accuracy of 93.8% and 95.0%, as well as average retrieval precision of 90.5% and 93.4% on two standard 3D shape recognition datasets (ModelNet40 and ModelNet10), respectively, which outperforms the existing works.